Electron-discharge device



oct. 27, 1925. 1,559,280

Vf L. RONCI l ELECTRON DISCHARGE DEVI CE 'Filed March 25. 1925 www 427/ Patented Oct. 27, 1925.

UNITED vSTATES 1,559,280 PATENT OFFICE.

VICTOR Ia. RONCI, OF BROOKLYN, NEW YORK, ASSIGNOR '1.0I WESTERN ELECTRIC COM- PANY, INCORPORATED, OF NEW YORK, N. Y., A. CORPORATION 0F NEW YORK.

ELECTRON-DISCHARGE DEVICE.

Application filed March v23, 1923. SerialI No. 627,106.`

To all 'whom t may concern:

Be it known that I, VICTOR L. RoNoI, a citizen of the United States, residing at Brooklyn, in the county of Kings, State of New York, have invented certain new and useful Improvements in Electron-Discharge Devices, of which-the following is a full, clear, concise, and exact description.

This application relates to electron discharge devices and pertains especially to the supporting of theelectrodes.

The object of this invention is to attach securely metallic supporting rods and insulating members to provide a supporting structure for the electrodes.

To attain this object, the ends of the metallic supporting rods are threaded and passed through apertures in the insulating members and Wire helices are screwed to the threads at o posite sides of the insulating members an in contact with the faces of said members to clamp them in position relative to the rods.

This arrangement makes possible the use of highly refractory metals such as molybdenum which could not be used in the form of nuts because of the dili'iculty of machining such metals. In addition, because of the use of highly refractory metals, the parts may besubjected to a higher heat treatment While being pre-glowed thereby shortening the time requiredA for final pumping. The coils also require less space thereby providing a greater amountof insulation between the metallic supporting members and the other metal parts of the device.

Referring now to the drawings, Fig. 1 is an elevation, partially broken away, of an electron discharge device embodying the invention. Fig. 2 v1s a section on the line ,2-2 of Fig. 1 and Fig. 3 is an enlarged detail view.

The invention is herein disclosed as embodied in an electron discharge device in which the anode 10 forms a portion ofthe containing vessel, a glass member 11 being sealed thereto from the stem of which (not shown) the 4electrode structure is supported by the metallic rods 12 in the well known manner. The ends of the rods 12 are threaded and extend through apertures in the insulating disc 13, this disc4 being a part of the electrode supportin structure. The arrangement of the ends of t e members l2 within the apertures is such that the threads extend on either side of the member 13. To maintain the member 13 in position relative to the rods 12, a wire helix 14 1s arranged on the rod at either side of the member 13. These helices are preferably formed of a highly refractory metal wire such as molybdenum having a diameter approximately equal to the pitch ofthe threads on the rod and are tightly wound, the innerdiameter of the coils being slightly less'than the outside vdiameter of the threads. One of the helices is screwed on to the threaded end of the rod 12 before it is passed through the operture in the member 13 and theV other-'helix 14 is threaded on afterward. The two helices are screwed toward each other until they securely clamp between'their adjacent ends the member 13. The resiliency of the Wire of which these helices are formed results `in a lock-nut action between the various turns of the helices and prevents them from becoming loosened under ordinary conditions of use. This same method of attachment is used in connection with the rods 15, 16 and 17 which are shown extending from the member 13 into the envelope of the device.

The cylindrical form `of the clamping members 14 serves to 'increase materially the insulation between the supporting rods over that when nuts of the ordinary type are used, and also renders uniform the 'space between the various adjacent rods.

The invention claimed is:

1. In an electron discharge device, an evacuated vessel, an insulating member having an aperture, a threaded metallic member extending through said aperture, and a helix of highly refractory metal having its turns engaging the threads on said metallic member, said helix having one end abutting said insulating member.v

2. An electron discharge device comprising an evacuated vessel, an insulating member having an aperture, a threaded-metallic member extending through said aperture, an abutment on said member, and a molybdenum wire wound in the threads of said member, one end of said Wire being in conact with a face of Said insulating mem- In Witness whereof, I hereunto subscribe my name this 20 day of March A. D., 1923.

VICTOR L ,.RoNCI. 

